A reliable supply of hot water is something most homeowners take for granted until it stops working. A cold shower and a strange noise from the basement are quick reminders of how vital water heaters are to your daily comfort. They constantly work to provide hot water, and that continuous effort accounts for about 18% of your home's energy use, typically your second-largest utility expense.

If something is wrong with your water heater, but you don't know whether it's fixable or time for a replacement, that uncertainty can be stressful. The stakes are high and can include unexpected costs and household disruption. This guide provides clear answers from a trusted Greenville plumbing expert, covering signs that point to a service call and when it's time for a new unit.

How Long Do Water Heaters Last?

Traditional tank water heaters and tankless units have different lifespans, and understanding how long each system will last will help you make the right choice if you decide to replace yours.

The average water heater lifespan is 6 to 13 years for a traditional unit, while some tankless units can last up to 20 years. How long your water heater lasts depends on several factors, including:

  • Water quality: Hard water speeds up wear and increases sediment buildup.
  • Maintenance frequency: Regular flushing and anode rod replacement can extend the water heater's life expectancy.
  • Installation quality: Proper installation prevents water heaters from failing sooner.
  • Household usage volume: Higher demand places more stress on the system.

Energy efficiency experts recommend considering replacement at the 10-year mark.

How to Check Your Water Heater's Age

Many homeowners don't know their water heater's age, especially if they moved into an existing home. Check the unit's data plate near the top of the tank for the serial number. A licensed plumber can also identify the age during a service call.

4 Signs Your Water Heater Needs Inspection or Maintenance

Your water heater gives you noisy or visible signs well before it fails. Noticing these signs early can save you from an emergency service call. In many cases, a professional inspection can address issues before they become costly repairs, giving you peace of mind.

Local plumbing experts offer 24/7 service and proactive maintenance through an annual plumbing health check.

Inconsistent or Insufficient Hot Water

Water that doesn't get as hot as it used to or runs out sooner is often the first sign homeowners notice. The good news is that this problem usually has a diagnosable cause.

  • Sediment buildup: Mineral deposits at the bottom of the tank reduce capacity and efficiency, forcing the heating element to work harder.
  • Failing heating element or thermostat: Heating elements wear out, and thermostats drift out of calibration.

Neither issue automatically means you need a replacement.

The recommended setting is 120° Fahrenheit, so if your thermostat is set to that and the problem persists, a service call will help you identify the issue.

Rumbling or Popping Noises From the Tank

Strange noises, like popping or rumbling, can be the sound of hardened sediment in your tank being reheated. You're hearing water forcing through the mineral deposits. If the mineral deposits aren't taken care of, the strain shortens the unit's lifespan and reduces efficiency.

A professional tank flush can resolve this. Greenville’s water contains chlorine, and mineral buildup can still be a concern for water heaters. Annual tank flushing helps prevent this problem.

Discolored or Rusty Hot Water

If your hot water runs rusty or brownish while cold water runs clear, the issue is coming from your water heater. This sign points to one of two causes:

  • Depleted anode rod: This component corrodes to protect tank walls and should be inspected annually and replaced every three to five years.
  • Internal tank corrosion: Once corrosion takes hold, replacement becomes the most reliable solution.

This symptom can go either way depending on progression. If corrosion in the tank walls has started, catching it early prevents bigger problems and gives you time to plan if you decide to replace.

Unexplained Increase in Energy Bills

Water heating ranks among the biggest energy draws in your home. As the system ages or accumulates deposits, it loses efficiency and runs longer because the sediment insulates the heating element.

If your bills have climbed unexpectedly, check your water heater with a professional first. A plumbing health check can identify whether it's fixable or something more serious.

3 Signs It's Time for Water Heater Replacement

The signs we just discussed point to fixable problems. But there are other signs that indicate your unit has reached its limit. Continuing to repair a water heater that's past its lifespan may no longer be practical. At this stage, when to replace the water heater becomes a genuine question.

Your Water Heater Is Past Its Lifespan

Age alone isn't a reason to replace a functioning unit, but age combined with warning signs means it's time to think about a hot water heater replacement. When your unit is past its expected lifespan and showing signs of failure, you're borrowing time on a failing appliance.

Plan for replacement before it becomes an emergency. Check your unit's age using the serial number method, or call a licensed plumber to assess how much longer it can operate.

Leaks or Water Pooling Around the Unit

Active leaks are the most urgent signal for replacement because they can worsen and cause even more damage to your home.

But not all leaks mean replacement. Small leaks at fittings or valves can often be repaired, but leaks from the tank body itself mean there are internal fractures or corrosion that can't be fixed.

Any pooling around the base should be checked quickly. Don't troubleshoot this yourself — call for emergency water heater service right away.

Corrosion or Rust on the Tank

Visible corrosion on the tank exterior or around connections is not a good sign, because once rust establishes itself, it spreads. An exterior rust spot often indicates a deeper problem within the tank walls.

Replacement is the only recommendation at this stage. Corrosion signals compromised integrity, and continuing to use the unit increases the risk of leaks and potential water damage.

Tankless vs. Traditional Water Heater: Which Should You Choose?

Once you decide you need a replacement, your next question is which type makes sense for your home. Each option has unique benefits worth considering for your specific situation. Here's a quick comparison between tankless water heaters and traditional water heaters. 

Feature Traditional Water Heater Tankless Water Heater
Lifespan 8–12 years with proper maintenance 15–20 years with proper maintenance
Energy Efficiency Stores hot water continuously, which uses more energy over time Heats water on demand, reducing standby energy loss
Upfront Cost Lower initial investment Higher upfront cost, but long-term energy savings offset the difference
Space Requirements Requires a dedicated tank area (typically 40–50 gallons) Compact, wall-mounted design saves floor space
Best For Households with predictable, moderate hot water needs and budget-conscious buyers High-demand households, smaller homes, or homeowners prioritizing long-term efficiency

 

Water heater replacement cost varies depending on the type you choose and your home's specific requirements. Professional plumbers can help you choose and install the right unit for your home and budget. Flexible financing options make tankless water heater replacement manageable. 

Schedule Water Heater Service With Benjamin Franklin Plumbing® of Greenville

Whether your water heater needs service or replacement, Benjamin Franklin Plumbing of Greenville is ready to help. Our licensed plumbers are available 24/7 with no after-hours fees. You'll receive up-front pricing approved before work begins, along with comprehensive water heater warranties and guarantees and flexible financing options.

Our on-time guarantee backs every service call. If there's any delay, it's you we pay! We'll pay you $5 per minute, up to $300. Schedule water heater service online or call today. For additional information, visit our frequently asked questions page.